#!@PREFIX@/sbin/runscript
# Copyright (c) 2007-2009 Roy Marples <roy@marples.name>
# Released under the 2-clause BSD license.

description="Mount the sys filesystem."

depend()
{
	keyword -vserver
}

mount_sys()
{
	grep -Eq "[[:space:]]+sysfs$" /proc/filesystems || return 1
	mountinfo -q /sys && return 0

	if [ ! -d /sys ]; then
		if ! mkdir -m 0755 /sys; then
			ewarn "Could not create /sys!"
			return 1
		fi
	fi

	ebegin "Mounting /sys"
	if ! fstabinfo --mount /sys; then
		mount -n -t sysfs -o noexec,nosuid,nodev sysfs /sys
	fi
	eend $?
}

mount_misc()
{
	# Setup Kernel Support for securityfs
	if [ -d /sys/kernel/security ] && \
		! mountinfo -q /sys/kernel/security; then
		if grep -qs securityfs /proc/filesystems; then
			ebegin "Mounting security filesystem"
			mount -n -t securityfs -o nodev,noexec,nosuid \
				securityfs /sys/kernel/security
			eend $?
		fi
	fi

	# Setup Kernel Support for debugfs
	if [ -d /sys/kernel/debug ] && ! mountinfo -q /sys/kernel/debug; then
		if grep -qs debugfs /proc/filesystems; then
			ebegin "Mounting debug filesystem"
			mount -n -t debugfs -o nodev,noexec,nosuid \
				debugfs /sys/kernel/debug
			eend $?
		fi
	fi

	# Setup Kernel Support for configfs
	if [ -d /sys/kernel/config ] && ! mountinfo -q /sys/kernel/config; then
		if grep -qs configfs /proc/filesystems; then
			ebegin "Mounting config filesystem"
			mount -n -t configfs -o  nodev,noexec,nosuid \
				configfs /sys/kernel/config
			eend $?
		fi
	fi

	# set up kernel support for cgroups
	if [ -d /sys/fs/cgroup ] && ! mountinfo -q /sys/fs/cgroup; then
		if grep -qs cgroup /proc/filesystems; then
			ebegin "Mounting cgroup filesystem"
			local opts="nodev,noexec,nosuid,mode=755,size=${rc_cgroupsize:-10m}"
			mount -n -t tmpfs -o ${opts} cgroup_root /sys/fs/cgroup
			eend $?
		fi
	fi
}

mount_cgroups()
{
	yesno ${rc_cgroups:-YES} && [ -e /proc/cgroups ] && \
		mountinfo -q /sys/fs/cgroup || return 0

	local agent="@LIBEXECDIR@/sh/cgroup-release-agent.sh"
	mkdir /sys/fs/cgroup/openrc
	mount -n -t cgroup \
		-o none,nodev,noexec,nosuid,name=openrc,release_agent="$agent" \
		openrc /sys/fs/cgroup/openrc
	echo 1 > /sys/fs/cgroup/openrc/notify_on_release
	while read name hier groups enabled rest; do
		case "${enabled}" in
			1)	mkdir /sys/fs/cgroup/${name}
				mount -n -t cgroup -o nodev,noexec,nosuid,${name} \
					${name} /sys/fs/cgroup/${name}
				;;
		esac
	done < /proc/cgroups
}

start()
{
	local retval
	mount_sys
	retval=$?
	if [ $retval -eq 0 ]; then
		mount_misc
		retval=$?
	fi
	if [ $retval -eq 0 ]; then
		mount_cgroups
		retval=$?
	fi
	return $retval
}
